Truing device



Aug. 21, 1934. H. SPENCER El AL TRUING' DEVICE.

Harold S ncer Frank 11a Vi-S' Filed NOV. 21, 1953 Patented-Aug. 21,1934 I a V UNITED STATES PATENT @FFECE TRUING DEVICE V v Harold Spencer and Frank Davis, Du Quoin, Ill. Application November 21, 1933 Serial No. 699,041 4 ClaimS. (Cl. 82'4) This invention relates in general to a device the shaft, it has been necessary to remove the for truing the connecting rod crank pins of crank shaft of an internal combustion engine engines, particularly internal combustion enfrom the engine block in order to true the same. gines, and other bearing portions of shafts. This involves a great deal of inconvenience as a 5 Truing tools have been previously devised for well as hard labor, and it is one of the objects 60 purposes similar to the one above set forth, of this invention to provide a tool of this charthcse having consisted generally of a split collar acter which may be placed upon the crank shaft hinged at one side and having a means for deof an automobile and employed for the purpose tachably securing the parts together at the other of truing the connecting rod bearings of the same side, and a plurality of cutting tools spaced about without involving the necessity of removing the the inner wall of the collar adjustable toward crank shaft from the engine either for the purand from the center thereof for the purpose of pose of placing the collar around the shaft or cutting into the shaft and truing it round when for the purpose of turning the collar after it is the collar is revolved. However, in devices such around the shaft.

was this it is obviously necessary to use the most Anotherobject of this invention to provide extreme care in adjusting the cutting tools toa tool of the character described which may be ward and from the shaft, this adjustment obvireadily and easily placed around the bearing porously involving considerable time in order that tion ofa crankshaft or other shaft and firmly all tools might be adjusted inward by an equal secured in position thereon, after which it may be V amount so that no one tool will project outwardly revolved upon the shaftfor the purpose of truing further than the others. If this latter condibearing portions of the same, it being necessary tion should exist through carelessness or lack during-this truing operation to make buta single of skill in the adjustment, not only would the adjustment in order to keep a single knife in tool projecting out the furthest be given an proper contact withthe shaft and at the same time excessive load and consequently be damaged to properly guide the shaft with respect to the thereby, but also the shaft would be allowed to knife. This tool is to be so constructed that it wobble within the truing collar, and the result will be adaptable to shafts of a wide range of sizes would be a bearing portion on the shaft which without any alteration except the single adjustwould not be true. ment above mentioned.

' 3Q Also, there have been provided toolsfor the Other objects andadvantages of this invention purpose above set forth in which a collar is will become apparent from the following descripdivided substantially along its diameter; a pair tion taken in connection with the accompanying of fixed'bearing members being positioned at an drawing, it beingunderstood that the same is by angle to each other within one of the semi-cirway of illustration and example only and is not 35 cular portions of the collar and an. adjustable to be takenas in any way limiting the spirit or cutter being positioned for slidable adjustment scope of this invention. The spirit and scope of in the other portion of the collar at a point oppothis invention is to be limited only by the prior site the fixed bearing members. However, in art and by the terms of the appended claims. such a case as this it becomes necessary to place Referring now more particularly to thedrawing 40 extra adjustable bearing members on that porin which like numerals indicate corresponding tion of the collar carrying the cutter in order that parts throughout: the shaft might be accurate1y guided because Figure 1 is a side elevation illustrating a tool of the fact that the cutteris mounted on one embodying this invention. portion of the collar and the fixed bearing mem- Figure 2 is a view taken along the line 2-2 of 5 here are mounted on the other portion. Since it Figure 1. t

' is necessary to have a plurality of adjustable Figure 3 is a plan view of the device illustrated bearings as well as an adjustable cutter, the same in Figure 1.

difficulty arises as was mentioned above in con- Figure 4 is a view taken along the line 4-4 of nection with those tools having a plurality of Figure 1. 1 50 cutters. Figure 5 is a perspective view with parts broken In the priordevices furthermore because of away of a means for rotating the tool upon the the nature of the various means for joining toshaft. gether the separate portions of the collar, or In accordance with this invention a collar 1. is because of the levers or other members provided provided which is in thickness substantially equal 55 for turning the collar after it was in place upon to the length of the bearing which is to be trued thereby. This collar 1 as illustrated consists of a complete disc with the exception that it is slotted from one side thereof at 2 with a slot which is wide enough to admit the largest shaft which it is proposed for the tool to be used on. The side Walls of this slot are provided with grooves 3 which are intended to serve as guides for the sliding cutter block 4 having tongues 5 adapted to slide in the said grooves.

t the outer end of the slot 2 the terminal portions of the collar member 1 are cut away substantially at right angles to the slot for the purpose of receiving a block in the form of a segment 6, this segment being of such size and shape as to complete the circle of the disc collar member 1 and close the end of the slot.2 therein. Theterminal portions of the collar 1 are provided with tapped holes and the ends of the segment 6 are likewise provided with holes for the purpose of receiving the screws '7 to secure the segment in place on the collar. The segment is counter-sunk at 8 so that the heads of the screws 7 may lie within the outer contour of the circle of the collar and not offer any obstruction to the free rotation of the collar on the shaft.

In order to provide for the adjustment of the block 4 within the slot 2, the segment 6 is provided with an opening 9 therethrough substantially at its center, said opening 9 having an enlarged portion 10 at the inner wall of the segment thus providing a shoulder 11. The block 4 is provided with a tapped opening therethrough in line with the opening 9 for the purpose of receiving the screw 12. This screw 12 is provided with a head 13 shaped to receive a wrench for the purpose of adjusting the same, and is also provided with a radially extending collar or flange 14 of a size to substantially fit within the enlarged portion 10 of the opening 9 in .the segment 6. When the parts are in assembled position as shown, the head 13 of the screw 12 is disposed within the small portion of the opening 9 and the flange 14 is disposed within the larger portion of this opening and against the shoulder 11. It will thus be seen that by turning the head 13 with a wrench inserted into the opening 9 the block 4 may be adjustably positioned within the slot 2.

Positioned at the inner end of this slot 2 and substantially at right angles to each other are a pair of fixed bearing members 15 adapted to bear against the sides of the bearing portion on the shaft and maintain it in proper position with respect to the cutter 16 which is mounted on the block 4. It is noted that the cutter 16 when positioned in operative relation with respect to the remainder of the tool is considerably closer to one of the bearing portions 15 than it is to the other. As viewed in Figure 1 it will be seen that the leading edge of the cutting tool 16 is so located that the truing tool is adapted to be turned in a counter-clockwise direction. Thus it will be seen that the right hand bearing member 15 is almost opposite the cutting member 16 and will serve to take the major portion of the pressure exerted by the cutting member against the shaft. The left hand bearing member 16 is on the other hand positioned so as to receive very little of this pressure exerted by the cutting member, but it is so positioned as to receive substantially all of the pressure caused by the turning of the tool upon the shaft. Thus it is apparent that the cutter 16 and the two bearing members 15 are so positioned with respect to each other that they will operate in the most efiicient manner for the purpose of most accurately positioning the shaft with respect to the cutting member and obtaining a true surface on the shaft. When the tool has been turned around once or twice it is only necessary to insert a wrench in the opening ii and ive the head 13 of the screw 12 a partial turn thus forcing the block 4 further into the slot 2 and consequently forcing the tool 16 against the side of the shaft so that when it is further rotated it will continue its work of truing the shaft.

For the purpose of enabling this tool to be easily and readily turned upon the shaft after it has been placed thereon, there are provided a series of radially extending openings 17 in the outer circumference of the collar 1. These openings may be engaged by some tool such as the hollow lever 13 illustrated in Figure 5, and the tool turned on the shaft by this means. This lever 18 is made with its end portion hollow so that it may also be inserted within the opening 9 when that opening is more convenient than one of the openings 17.

By virtue of the construction of this device it will be seen that there are no projecting parts which would interfere with the placing of this tool around one of the connecting rod portions of the crank shaft of an internal combustion engine without removing the crank shaft from the engine. It is merely necessary to remove the segment 6 and block 4 from the collar 1, slip the collar over the bearing on the crank shaft until the bearing portion comes in contact with the bearing members 15, rotate the collar 1 on the crank shaft until the slot 2 is downward, place the block 4 within the slot 2 and secure the segment 6 in place by means of the screws 7. A

socket wrench may then be employed for the purpose of adjusting the block 4 until the cutting tool 16 bears against the bearing portion of the shaft, after which the tool may be rotated counterclockwise when viewed as in Figure 1 to cause the tool 16 to true the bearing portion of the shaft. With the plurality of openings 17 provided around the exterior of the collar 1, and also with the aid of the opening 9 which serves the dual purpose of containing the head 13 of the screw 12 and of receiving the end of the tool 18, the tool 18 may be successively inserted in these openings and turned upon the shaft even through the small openings which are customarily provided for access into crank cases of engines of the type under discussion.

It will be seen that by the construction described, the block 4 which carries the tool 16 is very firmly supported within the same member 1 which carries the fixed bearing members 15, whereby the shaft will at all times be held in proper position with respect to the cutting member 16 and a very true and accurate result will be produced by this tool. Only a single adjustment for this tool is required, and there is no danger from the carelessness or lack of skill on the part of the operator. Much less time is consumed and the result produced is a considerable improvement over the prior art.

What we claim is:

1. In a device of the character described, a one-piece disc-like collar having a radial slot extending from one edge thereof slightly past the center of the collar and being adapted to receive a shaft bearing portion substantially at the center of the collar, a pair of fixed bearing plates positioned at an angle to each other at the inner end of said slot and adapted to engage and center the shaft bearing portion with respect to the slot, a cutter block slidably mounted in said slot, a cutter mounted in said block at a position substantially opposite one of said bearing plates", said cutter being so positioned as to require rotation in the direction of the other of said plates in the cutting operation, segmental means detachably secured to said collar at the outer end of said slot to close the end thereof, said segmental means being shaped to conform to the outer contour of said collar, screw means threadedly engaging said cutter block and bearing against said segmental means to adjustably position said block in said slot, said segmental means having an opening thereinand said screw means having a head thereon whereby a suitable tool may be inserted through said opening and engaged with said head to adjust said screw means, said collar having a series of radial sockets spaced about its circumference for the purpose of successively receiving a leverlfor turning said collar to carry out the cutting and truing operation.

2. In a device of the character described, a disc-like collar having a slot extending from one edge thereof slightly past the center of the collar, a pair of fixed bearing positioned at the inner end or" said slot and slightly spaced from each other toward opposite walls of the slot, a cutter block slidably mounted in said slot, a cutter on said block at a position substantially opposite one of said bearings, said cutter being so positioned as to require rotation in the direction of the other of said bearings in the cutting operation, segmental means completing the circular contour of said collar detachably secured to said collar at the outer end of said slot to close the end thereof, and means adjustably engaging said cutter block and bearing against said segthe other of said bearings in the cutting operation, an abutment member detachably secured to said collar at the outer end of said slot to close the end thereof, and means adjustably engaging said cutter block and bearing against said abutment member to adjustably position said block in said slot.

4. In a device of the character described, a disc-like collar having a slot extending from one edge thereof slightly past the center of the collar, a pair of bearings positioned at the inner end of said slot and slightly spaced from each other toward opposite walls of the slot, a cutter block slidably mounted in said slot, a cutter on said block at a position substantially opposite one of said bearings, said cutter being so positioned as to require rotation in the direction of the other of said bearings in the cutting operation, an abutment member detachably secured to said collar at the outer end of said slot to close the 1 end thereof, and adjustable meansbetween said cutter block and said abutment member to adjustably position said block in said slot.

HAROLD SPENCER. FRANK DAVIS. 

